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added note about unsupplied-arg

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svn: r10483
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Robby Findler 2008-06-27 22:27:31 +00:00
parent 69b4ffc7c0
commit c4be4bd7a5
1 changed files with 4 additions and 0 deletions
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4
collects/scribblings/reference/contracts.scrbl
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@ -453,6 +453,10 @@ If the identifier position of the range contract is
expressions are evaluated when the function is called (and
the underscore is not bound in the range). Otherwise the
range expressions are evaluated when the function returns.
If there are optional arguments that are not supplied, then
the corresponding variables will be bound to a special value
called the @scheme[unsupplied-arg] value.
}
@defform*/subs[#:literals (any values ->)